The NCstar AR10 Upper Receiver Block is engineered specifically for AR10 (.308/7.62x51) type receivers to facilitate professional assembly and maintenance of your rifle build.NCstar AR10 Upper Receiver Vise BlockCompatible with AR10 (.308/7.62x51) receiversDurable aluminum constructionBlue anodized finish for corrosion resistance29.0 oz weight for stability during useEssential gunsmithing tool for securely holding AR10 upper receivers during barrel installation handguard mounting and general maintenance tasks. The precision-machined aluminum construction ensures reliable clamping without damaging your receiver.